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Revenue Recognition Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Disaggregation of Revenue [Line Items]
Revenue, Net	$ 6,098	$ 5,594	$ 11,960	$ 10,935
Products and Systems [Domain]
Disaggregation of Revenue [Line Items]
Revenue, Net	4,617	4,032	9,037	7,831
Services [Domain]
Disaggregation of Revenue [Line Items]
Revenue, Net	1,481	1,562	2,923	3,104
Building Solutions North America
Disaggregation of Revenue [Line Items]
Revenue, Net	2,227	2,092	4,379	4,126
Building Solutions North America | Products and Systems [Domain]
Disaggregation of Revenue [Line Items]
Revenue, Net	1,343	1,272	2,642	2,514
Building Solutions North America | Services [Domain]
Disaggregation of Revenue [Line Items]
Revenue, Net	884	820	1,737	1,612
Building Solutions EMEA/LA
Disaggregation of Revenue [Line Items]
Revenue, Net	958	934	1,917	1,882
Building Solutions EMEA/LA | Products and Systems [Domain]
Disaggregation of Revenue [Line Items]
Revenue, Net	536	466	1,080	934
Building Solutions EMEA/LA | Services [Domain]
Disaggregation of Revenue [Line Items]
Revenue, Net	422	468	837	948
Building Solutions Asia Pacific
Disaggregation of Revenue [Line Items]
Revenue, Net	623	594	1,298	1,198
Building Solutions Asia Pacific | Products and Systems [Domain]
Disaggregation of Revenue [Line Items]
Revenue, Net	448	320	949	654
Building Solutions Asia Pacific | Services [Domain]
Disaggregation of Revenue [Line Items]
Revenue, Net	175	274	349	544
Global Products
Disaggregation of Revenue [Line Items]
Revenue, Net	2,290	1,974	4,366	3,729
Global Products | Products and Systems [Domain]
Disaggregation of Revenue [Line Items]
Revenue, Net	2,290	1,974	4,366	3,729
Global Products | Services [Domain]
Disaggregation of Revenue [Line Items]
Revenue, Net	0	0	0	0
Global Products | Global Products - HVAC [Domain]
Disaggregation of Revenue [Line Items]
Revenue, Net	1,658	1,374	3,141	2,592
Global Products | Global Products - Fire & Security [Domain]
Disaggregation of Revenue [Line Items]
Revenue, Net	578	537	1,122	1,025
Global Products | Global Products - Industrial Refrigeration [Domain]
Disaggregation of Revenue [Line Items]
Revenue, Net	$ 54	$ 63	$ 103	$ 112

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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